低压电力线载波通信信道衰减特性的建模研究

低压电力线载波通信已成为智能电网建设中重要的本地通信手段.但低压电力线通信环境恶劣,影响通信性能,因此必须掌握其信道特征.文章针对文献中提出的各种关于低压电力线载波信道衰减特性的模型理论归纳比较,并基于二端口网络理论、传输线理论及应用矢量匹配法,提出较完整且方便应用的衰减特性模型方案.在实验室搭建用于模拟低压配电网的小型树状网络,验证衰减特性模型方案的可行性.研究成果有利于低压电力线载波信道的模拟仿真.

Modeling Research on Channel Attenuation Characteristic of the Low-voltage Power Line Carrier Communication

Low-voltage power line carrier communication(LV-PLC) has become an important mean of local communication in the Smart Grid construction.As the poor environment of the low-voltage power line affects the performances of LV-PLC,it is vital to explore and understand the power line channel characteristics.This paper summarizes and compares the merits and limitations of different modeling solutions of attenuation characteristics of LV-PLC channel described in literatures.Based on two-port network theory,transmission line theory and vector fitting theory,a complete,clear and easy-to-use modeling solution is put forward.At last,a small tree-like topology network is set up in the laboratory to simulate the low-voltage distribution network and confirm the validity of the attenuation characteristics model.The research results are helpful for the simulation of the LV-PLC channel.